Clefable seems like a strong Normal type, and the fact that it's not super effective against anything doesn't mean it can't have an effective moveset. Metronome is a baddy bad bad move unless you're just using it for fun. Clefable has a pretty good Special Attack, so I was thinking of having:

Sunny Day
Solar Beam
Flamethrower
Thunder Wave/Reflect/Rest (in which case a berry will be used to cure sleep)